/// <summary>
/// Saves the GridViewSearchPanel State.
/// </summary>
/// <param name="controlState">State of the control.</param>
/// <param name="controlStateName">Name of the control state.</param>
/// <param name="persistenceMethod">The persistent method.</param>
/// <param name="persistentCookieExpiryDateTime">The persistent cookie expiry datetime.</param>
public static void SaveGridViewSearchPanelState( GridViewSearchPanelState controlState, string controlStateName,
PersistenceMethod persistenceMethod, DateTime? persistentCookieExpiryDateTime )
{
switch ( persistenceMethod )
{
case PersistenceMethod.Session :
#region Uses Session state
HttpContext.Current.Session[ controlStateName ] = controlState;
#endregion
break;
case PersistenceMethod.Cookie :
case PersistenceMethod.PersistentCookie :
#region Uses a client cookie
string serializedString = SerializeGridViewSearchPanelState( controlState );
HttpCookie cookie = new HttpCookie( controlStateName, HttpContext.Current.Server.UrlEncode( serializedString ) );
// Determine if this should be persisted longer than just the current session
if ( persistentCookieExpiryDateTime != null )
{
cookie.Expires = persistentCookieExpiryDateTime.Value;
}
HttpContext.Current.Response.Cookies.Add( cookie );
#endregion
break;
}
}
/// <summary>
/// Serializes the grid view search panel state.
/// </summary>
/// <param name="controlState">The control state.</param>
/// <returns></returns>
private static string SerializeGridViewSearchPanelState( GridViewSearchPanelState controlState)
{
string serializedString = string.Empty;
using ( StringWriter stringWriter = new StringWriter() )
{
XmlSerializer serializer = new XmlSerializer( typeof( GridViewSearchPanelState ) );
serializer.Serialize( stringWriter, controlState );
serializedString = stringWriter.ToString();
}
return serializedString;
}
/// <summary>
/// Handles the state of the GridViewSearchPanel
/// </summary>
/// <param name="searchPanel">The search panel.</param>
/// <param name="gridView">The grid view.</param>
/// <param name="persistenceMethod">The persistence method</param>
/// <param name="persistentCookieExpiryDateTime">The date and time the persistent cookie expires</param>
public static void HandleGridViewSearchPanelState( GridViewSearchPanel searchPanel, GridView gridView,
PersistenceMethod persistenceMethod, DateTime? persistentCookieExpiryDateTime )
{
if ( gridView == null )
{
// try and find the GridView control if it hasn't been explicitly supplied
gridView = FindControl( searchPanel.NamingContainer, searchPanel.GridViewControlID ) as GridView;
}
if ( gridView != null )
{
// restore any previously saved state
gridView.Page.Load += new EventHandler(
delegate( object sender, EventArgs e )
{
if ( !gridView.Page.IsPostBack )
{
GridViewSearchPanelState controlState = GetGridViewSearchPanelState( GetUniqueGridViewName( gridView ), persistenceMethod );
if ( controlState != null )
{
controlState.RestoreState( ref gridView, ref searchPanel );
}
}
}
);
// save state on row command, and rebind searchPanel
gridView.RowCommand += new GridViewCommandEventHandler(
delegate(object sender, GridViewCommandEventArgs e)
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState(gridView, searchPanel);
SaveGridViewSearchPanelState(controlState, GetUniqueGridViewName(gridView),
persistenceMethod, persistentCookieExpiryDateTime);
searchPanel.DataBind();
}
);
// save state when page index changes
gridView.PageIndexChanged += new EventHandler(
delegate( object sender, EventArgs e )
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState( gridView, searchPanel );
SaveGridViewSearchPanelState( controlState, GetUniqueGridViewName( gridView ),
persistenceMethod, persistentCookieExpiryDateTime );
}
);
// save state when grid is sorted
gridView.Sorted += new EventHandler(
delegate( object sender, EventArgs e )
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState( gridView, searchPanel );
SaveGridViewSearchPanelState( controlState, GetUniqueGridViewName( gridView ),
persistenceMethod, persistentCookieExpiryDateTime );
}
);
if (gridView is EntityGridView)
{
// save state when grid's page size changed
((EntityGridView)gridView).PageSizeChanged += new EventHandler(
delegate(object sender, EventArgs e)
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState(gridView, searchPanel);
SaveGridViewSearchPanelState(controlState, GetUniqueGridViewName(gridView),
persistenceMethod, persistentCookieExpiryDateTime);
}
);
}
// save state when search id done
searchPanel.SearchButtonClicked += new EventHandler(
delegate( object sender, EventArgs e )
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState( gridView, searchPanel );
SaveGridViewSearchPanelState( controlState, GetUniqueGridViewName( gridView ),
persistenceMethod, persistentCookieExpiryDateTime );
}
);
// save state when reset is done
searchPanel.ResetButtonClicked += new EventHandler(
delegate( object sender, EventArgs e )
{
GridViewSearchPanelState controlState = new GridViewSearchPanelState( gridView, searchPanel );
SaveGridViewSearchPanelState(controlState, GetUniqueGridViewName(gridView),
persistenceMethod, persistentCookieExpiryDateTime);
}
);
}
}
